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Component Information:
Block
The HT383 Block is a 1986 and later (1 piece rear main seal) design. The block is bored then deck plate honed
to a finished size of 4.005". Features include 4 bolt intermediate mains, clearanced for a 3.80" stroker crankshaft,
and machined for hydraulic roller or flat tappet lifters.
Any small block engine, regardless of year, that uses Vortec heads, will require an external coolant bypass line
from the intake manifold to the 5/8" hose nipple on the water pump (passenger's side). Suggested routing is from
the 3/8 NPSF boss on intake manifold to the water pump.
Crankshaft
The HT383 Engine comes with forged crankshaft part number 12489436. The crankshaft features are outlined
below:
• 3.800" stroke
• Externally balanced
• 2.45" main journals/2.10" rod journals (nominal - standard 350 Chevy engine)
• Radii on main and rod journals
• One-piece style rear main
• Number 1 and 4 crank pins hollowed
• Rod and main oil hole chamfered
• 3.000" crank flange bolt circle
• 4340 steel alloy, nitride treated
Connecting Rods
Forged Steel connecting rod with the centerline of crank pin bore to centerline of piston pin bore is 5.700". It has
been machined to clear camshafts in most small block stroker applications.
Engine Bearings
Main engine bearings, part number 12499102, are a 3/4 groove design which maintains the full surface area in
the most highly loaded portion of the lower main bearing, while permitting improved oil flow to the rod bearing.
Main bearings #1-4 are manufactured from an H-14 (four metals) alloy and have a hardened steel backing made
from SAE 1020 steel. The #5 flange bearing is manufactured from an H-24 (tri-metal) alloy and has a hardened
steel backing made from SAE 1008-1010 steel.
Rod bearings, part number 17800761, feature a full chamfer on one side to accommodate the radius on
the crankshaft journal. Rod bearings are manufactured from H-14 (four metals), and have a hardened steel
backing made from SAE 1020 steel.
HT383 Crate Engine Specifications
TITLE
ALL INFORMATION WITHIN ABOVE BORDER TO BE PRINTED EXACTLY AS SHOWN ON 8 1/2 x 11
WHITE 16 POUND BOND PAPER. PRINT ON BOTH SIDES, EXCLUDING TEMPLATES.
TO BE UNITIZED IN ACCORDANCE WITH GM SPECIFICATIONS.
FIRING ORDER: 1-8-4-3-6-5-7-2
19355751
REV 04OC17
PART NO.
DATE
06DE16
INITIAL RELEASE - JIM COVEY
04OC17
REVISION - JIM COVEY
4
SHEET
REVISION
27
OF
AUTH
N/A
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